Cita APA (7th ed.)

Spencer, H. (1969). The Penrose annual 1969: The international review of the graphic arts. Lund Humphries.

Cita Chicago (17th ed.)

Spencer, Herbert. The Penrose Annual 1969: The International Review of the Graphic Arts. Londres: Lund Humphries, 1969.

Cita MLA (9th ed.)

Spencer, Herbert. The Penrose Annual 1969: The International Review of the Graphic Arts. Lund Humphries, 1969.